Marathon Oil Announces Public Offering of Senior Notes

Marathon Oil Announces Public Offering of Senior Notes

HOUSTON, Oct. 24, 2012 (GLOBE NEWSWIRE) -- Marathon Oil Corporation (NYSE:
MRO) announced today that it intends to offer, subject to market and other
conditions, two series of senior notes in an underwritten public offering.

Marathon Oil intends to use the net proceeds of the proposed offering to repay
outstanding commercial paper obligations and for general corporate purposes.

Citigroup Global Markets Inc., Morgan Stanley & Co. LLC, J.P. Morgan
Securities LLC, RBS Securities Inc. and UBS Securities LLC are acting as joint
book-running managers for the proposed offering. When available, copies of the
preliminary prospectus supplement relating to the offering may be obtained
from the underwriters as follows:

Citigroup Global Markets Inc.        Morgan Stanley & Co. LLC
c/o Broadbridge Financial Solutions  180 Varick Street
1155 Long Island Avenue              New York, NY 10014
Edgewood, NY 11717                   Attention: Prospectus Department
Phone: 1-800-831-9146                Phone: 1-866-718-1649
J.P. Morgan Securities LLC           RBS Securities Inc.
383 Madison Avenue                   600 Washington Boulevard
New York, NY 10179                   Stamford, CT 06901
Attention: High Grade Syndicate Desk Attn: Debt Capital Markets Syndicate
3rd Floor                            Phone: 1-866-884-2071
Phone (collect): 1-212-834-4533
UBS Securities LLC
299 Park Avenue
New York, NY 10171                   
Attention: Prospectus Specialist
Phone: 877-827-6444 ext. 561 3884

The notes will be offered and sold pursuant to an effective shelf registration
statement on Form S-3 previously filed with the Securities and Exchange

This press release does not constitute an offer to sell or the solicitation of
an offer to buy the securities described herein, nor shall there be any sale
of these securities in any state or jurisdiction in which such offer,
solicitation or sale would be unlawful prior to registration or qualification
under the securities laws of any such jurisdiction. The offering may be made
only by means of a prospectus and related prospectus supplement.

This press release includes forward-looking statements. Forward-looking
statements give Marathon Oil's current expectations or forecasts of future
events based on assumptions and estimations that management believes are
reasonable given currently available information. Forward-looking statements
in this press release relate to, among other things, the offering of the notes
and use of proceeds. Information about risks and uncertainties that could
cause actual results to differ materially from those contemplated by the
forward-looking statements is available in Marathon Oil's filings with the

Marathon Oil Corporation is an independent international energy company. Based
in Houston, Texas, Marathon Oil had net proved reserves at the end of 2011 of
1.8 billion barrels of oil equivalent in North America, Europe and Africa.

CONTACT: Media Relations Contacts
         Lee Warren: 713-296-4103
         John Porretto: 713-296-4102
         Investor Relations Contacts
         Howard Thill: 713-296-4140
         Chris Phillips: 713-296-3213
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